Infiniti 22630-44B20 Engine Coolant Temperature Sensor

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The coolant temperature indicator system consists of a warning light or a temperature gauge on the dash and a coolant temperature sending unit mounted on the engine. On the models covered by this guide, the Engine Coolant Temperature (ECT) sensor, which is an information sensor for the Powertrain Control Module (PCM), also functions as the coolant temperature sending unit. If an overheating indication occurs, check the coolant level in the system, then ensure all connectors in the wiring harness between the sending unit and the indicator light or gauge are tight. When the ignition switch is turned to START and the starter motor is turning, the indicator light (if equipped) should come on. This doesn't mean the engine is overheated; it just indicates that the bulb is functional. If the light doesn't come on when the ignition key is turned to START, the bulb might be burned out, the ignition switch might be faulty, or the circuit might be open. As soon as the engine starts, the indicator light should go out and remain off, unless the engine overheats. If the light doesn't go out, check for any stored trouble codes in the Powertrain Control Module (PCM). If the engine tends to overheat easily, verify the coolant to ensure it's the proper type and concentration. For the ECT sensor replacement procedure.